Uncle Sam refer to the Federal government of United States.
Explanation:
The Spanish-American War ended in December, 1898, when Spain surrendered to the U.S. and negotiated a peace treaty that sold Guam, Puerto Rico, and the Philippines to the U.S. Cuba remained independent, but strongly under the influence of the United States. The Philippine Republic went to war against the U.S. to defend its independence. The brutal war lasted three years, and was followed by a half-century of U.S. occupation of the Philippines
Uncle Sam (U.S.) is a common national imagery of the U.S. federal government or the country in general that came into use during the War of 1812.
